support sdr2 files

[llogan]

Apparently H.264 video. Probably made from "Micro DVR" devices from Seorim Technology.

$ ffmpeg -i ak000073.sdr2 
ffmpeg version N-57646-gf031531 Copyright (c) 2000-2013 the FFmpeg developers
  built on Oct 30 2013 11:53:30 with gcc 4.8.2 (GCC)
  configuration: --enable-gpl
  libavutil      52. 48.100 / 52. 48.100
  libavcodec     55. 39.100 / 55. 39.100
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
ak000073.sdr2: Invalid data found when processing input

Sample ak000073.sdr2 (9.1M):
​http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket3099

Micro D Player:
​http://www.seorimtech.com/en/contents/customer/download/sdk/Mirco_D_Player_4.0.zip

The "Micro D Player" for Windows appears to be able to show at least one frame but consistently crashes for me, and it looks like it's using or contains some ffmpeg stuff:

$ strings _83E50CCB965F4FD0A291371E5629FF87 | grep enable
--disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib

[llogan]

The sample can now at least be demuxed and decoded, but I'm unsure if the result is correct (weird aspect ratio, noisy audio) due to not having a proper reference. I don't know which commits are responsible.

[Carl Eugen Hoyos]

Fixed by Paul in 8bcacd9f4262d70645adf8501add387f6aa3b164 and 9d297641ee0bcae51a503c6855000bd2455cdd35 / FFmpeg 2.2.